Grinding-machine



(No Model.) 2 Sheets-Sheei; 1.'

J.B. H. LEON ARD. GRINDING MACHINE.

No. 291,609. Patented Jan. 8, 1884.

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(No Model.) 2 She tS -Sheet 2.

.J. B. H. LEONARD.

GRINDING MACHINE.

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UNiTEn STATES PATENT EEicE.

JOHN B. H. LEONARD, OF NAUBUC, CONNECTICUT.

GRINDING- MACHINE.

SPECIFICATION forming-part of Letters Patent No. 291,609, dated January 8, 1884.

Application filed February 13, 1885. (F model.)

To aZZ whom it may concern:

Be it known that I, J OHN B. H. LEONARD, of N aubuc, Hartford county,Connecticut, have invented certain Improvements in Knife- Grinding Machines, of which the following is a specification.

My invention is a grinding-machine provided with a revolving grindstone and with a reciprocating carrier for the articles to be ingface.

5o placed between the face of the holder and the l secured to the end of a shaft, K, revolving in 100 ground, and constructed, as fully described hereinafter, so as to grind ariicles'of different shapes.

In the drawings, Figure l is a sectional plan of a grindingmachine illustrating my improvements. Fig. 2 is a front elevation. Fig. 3 is a plan of the earrieras arranged for grinding ,tapering articles. I Fig. 4 is an end view of Fig.3; and Fig. 5 is a section on the line 1 2, Fig. 3.

The blank to be ground is carried by a carrier, A, upon a slide, D, moved back and forth uponthe platform or table 13 of the machine in front of one edge of the grinding-wheel O. The carrier A is differently constructed and connected to the slide, according to the work to be ground, the slide being constructed to support different carriers. Thus, for grinding the blades of knives or other articles having rounded faces without any taper, the-carrier is suspended between the posts I) b on pivot-screws c c, as in Fig. 1, and is rocked thereon as the article is carried past the grind- When the article is'to be both tapered and rounded, the carrier is rocked, as before, and is also moved toward or from the grinding -face as it travels past the same, \Vhere only a taper is required, the rocking motion is dispensed with. The slide D de rives its motion past the grindstone from a crank-wheel, E, on a shaft, E, driven slowly and connected to the slide by a rod, (Z. The carrierAis provided with a holder, c, secured detachably to its face, and shaped to support the article to be ground, and the latter is held to the-carrier by a clamp consisting of one or more hooked bars, extending through holes in the carrier, and connected to a crossbar, on which turns an eccentric or cam, 9, provided with a handle, h. One end of the blank being hooks of the bars, the latter arebrought against and clamp the blank by turning the eccentric so as to draw back the bars. coiled round the bars, as shown, to throw the bars inward when the position of the eccentric is reversed. The rocking movement of the carrier 18 imparted from a crank-wheel, F, the pitman j of which is connected to a block, G, sliding on a standard, H, secured to the table. At the outer end of the block is a fingelyi, which extends into a groove, t", at the under side of the carrier A, which, as it is. carried over the finger and past the block, is rocked by the reciprocation of the latter.

The movement of the carrier to and from Springs may be r the grinding-wheel C is effected by means of a former with the bearin causes the carrier to b be moved outward in proportion as the thickness of the former increases, the former being shaped to correspond to the article to be ground, which is thus properly presented to the grindstone.

When the former is used, one of the posts, I), may slide on the supporting-slide D, so as to leave the carrier free to swing in and out at that end, anda spring, m, attached at one end to the post, is connected also to the slide, so as to hold the former against its bearing Z.

When the carrier is not to be rocked, the finger t is disconnected from the block G, or the crank-wheel.

The grinding-wheel has an annular face, and consists of a flanged ring, or segments forming a ring, fitting within the flange r of adisk, J,

bearings M N on the table, and driven in any suitable manner. The grinding -ring is secured to the disk J by a plate, L, clamped against the flange s of the ring by a nut, s, screwing on to the end of the shaft K.

It is necessary to feed the grinding-wheel forward as it wears away. This I effect by extending the shaft through a long bearingsleeve, 0, extending loosely through the divided bearing M, and threaded at the outside to receive a nut, P, which occupies aposition between the two parts of the divided bearing, so that on turning the nut the sleeve and its shaft will be moved longitudinally, a feather on the bearing extending into a longitudinal slot, 15, in the sleeve and preventing it from turnin The bolts securing the bearing M extend through longitudinal slots \V, and those securing thebearing N extend through curved slots, so as to permit the grindingwheel to be brought at an angle to thepath of the carrier, thereby presenting the corner or extreme periphery of the wheel as a cut-tingedge.

Without limiting myself to the precise devices described for imparting movements to the carrier and bearing-sleeve, as others may be adopted, 1 claim- 1. The combination, in a grinding-machine, of a revolving grindstone, a slide and appliances for reciprocating it past the stone at right angles to the shaft thereof, a carrier adapted to hold the article to be ground pivoted to the slide, and appliances, substantially as described, for rocking the carrier, as Specified.

2. The combination of the revolving annu- 1ar grindstone, the slide and the rocking carriersupported thereby, and means for rocking the same, a former secured to the outer face of the carrier, and ast-ationary bearing supported by the frame of the machine opposite to the former, the several parts being arranged to operate substantially as set forth.

3. The combination of the slide, the carrier supported to rock thereon, the revolving crank-wheel F, and connections whereby the carrier is rocked by the crank-wheel, substantially as set forth.

4. In a grinding-machine, the combination of a revolving grindstone connected to a longitudinally-adjustable shaft supported in horizontally-adjustable hearings. in combination with a carrier adapted to hold thearticle to be ground pivoted to a reciprocating slide, and appliances for rocking the carrier, substantially as and for the purpose set forth.

5. The combination of the flanged annular grindstone, the flanged disk J, and plate L, clamped upon the flange of the grindstone, substantially as set forth.

6. In a grinding-machine, the combination of a revolving grindstone, a slide and appliances for reciprocating it past the stone, a carrier adapted to hold the article to be ground, having a former secured thereto and pivoted to the slide, a stationary bearing supported by the frame of the machine opposite to the former, and appliances for rocking the carrier, substantially as specified.

In testimony whereot'I have signed my name to this specification in the presence of two subscribing witnesses.

I JOHN B. H. LEONARD.

' Vitnesses:

ARTHUR M. LEONARD, WILLIAM S. GosLEn. 

